521663434116 has 24 divisors (see below), whose sum is σ = 1327870559904. Its totient is φ = 158079828480.

The previous prime is 521663434099. The next prime is 521663434133. The reversal of 521663434116 is 611434366125.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (521663434099) and next prime (521663434133).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1975997725 + ... + 1975997988.

It is an arithmetic number, because the mean of its divisors is an integer number (55327939996).

Almost surely, 2^521663434116 is an apocalyptic number.

It is an amenable number.

521663434116 is an abundant number, since it is smaller than the sum of its proper divisors (806207125788).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

521663434116 is a wasteful number, since it uses less digits than its factorization.

521663434116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3951995731 (or 3951995729 counting only the distinct ones).

The product of its digits is 311040, while the sum is 42.

The spelling of 521663434116 in words is "five hundred twenty-one billion, six hundred sixty-three million, four hundred thirty-four thousand, one hundred sixteen".